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Title: Optimal lattice-structured materials

Journal Article · · Journal of the Mechanics and Physics of Solids
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

This paper describes a method for optimizing the mesostructure of lattice-structured materials. These materials are periodic arrays of slender members resembling efficient, lightweight macroscale structures like bridges and frame buildings. Current additive manufacturing technologies can assemble lattice structures with length scales ranging from nanometers to millimeters. Previous work demonstrates that lattice materials have excellent stiffness- and strength-to-weight scaling, outperforming natural materials. However, there are currently no methods for producing optimal mesostructures that consider the full space of possible 3D lattice topologies. The inverse homogenization approach for optimizing the periodic structure of lattice materials requires a parameterized, homogenized material model describing the response of an arbitrary structure. This work develops such a model, starting with a method for describing the long-wavelength, macroscale deformation of an arbitrary lattice. The work combines the homogenized model with a parameterized description of the total design space to generate a parameterized model. Finally, the work describes an optimization method capable of producing optimal mesostructures. Several examples demonstrate the optimization method. One of these examples produces an elastically isotropic, maximally stiff structure, here called the isotruss, that arguably outperforms the anisotropic octet truss topology.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344; LLNL-JRNL-683819
OSTI ID:
1305867
Alternate ID(s):
OSTI ID: 1397718
Report Number(s):
LLNL-JRNL-683819
Journal Information:
Journal of the Mechanics and Physics of Solids, Vol. 96, Issue C; ISSN 0022-5096
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 89 works
Citation information provided by
Web of Science

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Cited By (17)

3D Plate-Lattices: An Emerging Class of Low-Density Metamaterial Exhibiting Optimal Isotropic Stiffness journal September 2018
A geometric projection method for designing three-dimensional open lattices with inverse homogenization: A geometric projection method journal July 2017
Design, Fabrication, and Mechanics of 3D Micro‐/Nanolattices journal September 2019
Simple, accurate surrogate models of the elastic response of three-dimensional open truss micro-architectures with applications to multiscale topology design journal May 2019
A state-of-the-art review on types, design, optimization, and additive manufacturing of cellular structures journal July 2019
Lightweight, flaw-tolerant, and ultrastrong nanoarchitected carbon journal March 2019
Design, analysis and manufacturing of lattice structures: an overview journal December 2017
2D metamaterial with in-plane positive and negative thermal expansion and thermal shearing based on interconnected alternating bimaterials journal September 2019
Multiobjective optimization of modular structures: Weight versus geometric versatility in a Truss‐Z system journal July 2019
Field responsive mechanical metamaterials journal December 2018
Stiff isotropic lattices beyond the Maxwell criterion journal September 2019
Vacancies for controlling the behavior of microstructured three-dimensional mechanical metamaterials journal December 2017
Integrating lattice materials science into the traditional processing–structure–properties paradigm journal November 2019
The extreme mechanics of micro- and nanoarchitected materials journal October 2019
Stress Concentration and Mechanical Strength of Cubic Lattice Architectures journal July 2018
A geometric projection method for designing three-dimensional open lattices with inverse homogenization: A geometric projection method journal January 2018
Plate-nanolattices at the theoretical limit of stiffness and strength journal March 2020

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